Update app.py

app.py

@@ -775,7 +775,7 @@ def analyze_excel_single(file_path):
             results_df_nps = pd.read_csv(csv_output_path_nps)
             results_df_nps["Importance_percent"] = results_df_nps["Importance"] * 100
             average_value_nps = results_df_nps["Importance_percent"].mean()
-            img_nps = plot_model(
+            img_nps = plot_model_results(
                 results_df_nps,
                 average_value_nps,
                 f"NPS Drivers: {file_name}",